Unger Bertram, Klatzky Roberta, Hollis Ralph
IEEE Trans Haptics. 2013 Oct-Dec;6(4):496-505. doi: 10.1109/TOH.2013.35.
Using a high-fidelity haptic interface based on magnetic levitation, subjects explored virtual sinusoidal textures with a frictionless probe and reported the subjective magnitude of perceived roughness. A psychophysical function was obtained spanning 33 levels of spatial periods from 0.025 to 6.00 mm. Kinematic and dynamic variables were recorded at 1,000 Hz and used to derive a set of variables to correlate with the psychophysical outcome. These included position, velocity, kinetic energy, instantaneous force (based on acceleration), mean force, and variability of the z-axis force signal from the power spectral density. The analysis implicates power of the force signal as the physical correlate of perceived roughness of sinusoidal textures. The relationship between power and roughness held across the range of spatial periods examined.
使用基于磁悬浮的高保真触觉界面，受试者用无摩擦探头探索虚拟正弦纹理，并报告感知粗糙度的主观大小。获得了一个跨越从0.025到6.00毫米的33个空间周期水平的心理物理函数。运动学和动力学变量以1000赫兹的频率记录，并用于导出一组与心理物理结果相关的变量。这些变量包括位置、速度、动能、瞬时力（基于加速度）、平均力以及来自功率谱密度的z轴力信号的变异性。分析表明，力信号的功率是正弦纹理感知粗糙度的物理相关因素。在研究的空间周期范围内，功率与粗糙度之间的关系成立。
